I think I've corrected most of my mistakes, but it would be interesting if someone found any that I'd missed. Yes, it would be much appreciated to have images of posters for the various concerts, plus clippings of any information. The sort of thing Mark was requesting for his project.
I have conducted lots more interviews by e-mail since the last revised edition. It's also interesting to note that in the last decade, more people associated with the Beatles have published their biographies than in all the previous decades.